mirror of
https://github.com/livekit/livekit.git
synced 2026-03-30 17:45:40 +00:00
120 lines
3.1 KiB
Go
120 lines
3.1 KiB
Go
// Copyright 2023 LiveKit, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package streamallocator
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/livekit/protocol/logger"
|
|
)
|
|
|
|
// ------------------------------------------------
|
|
|
|
type NackTrackerParams struct {
|
|
Name string
|
|
Logger logger.Logger
|
|
WindowMinDuration time.Duration
|
|
WindowMaxDuration time.Duration
|
|
RatioThreshold float64
|
|
}
|
|
|
|
type NackTracker struct {
|
|
params NackTrackerParams
|
|
|
|
windowStartTime time.Time
|
|
packets uint32
|
|
repeatedNacks uint32
|
|
|
|
// STREAM-ALLOCATOR-EXPERIMENTAL-TODO: remove when cleaning up experimental stuff
|
|
history []string
|
|
}
|
|
|
|
func NewNackTracker(params NackTrackerParams) *NackTracker {
|
|
return &NackTracker{
|
|
params: params,
|
|
history: make([]string, 0, 10),
|
|
}
|
|
}
|
|
|
|
func (n *NackTracker) Add(packets uint32, repeatedNacks uint32) {
|
|
if n.params.WindowMaxDuration != 0 && !n.windowStartTime.IsZero() && time.Since(n.windowStartTime) > n.params.WindowMaxDuration {
|
|
n.updateHistory()
|
|
|
|
n.windowStartTime = time.Time{}
|
|
n.packets = 0
|
|
n.repeatedNacks = 0
|
|
}
|
|
|
|
//
|
|
// Start NACK monitoring window only when a repeated NACK happens.
|
|
// This allows locking tightly to when NACKs start happening and
|
|
// check if the NACKs keep adding up (potentially a sign of congestion)
|
|
// or isolated losses
|
|
//
|
|
if n.repeatedNacks == 0 && repeatedNacks != 0 {
|
|
n.windowStartTime = time.Now()
|
|
}
|
|
|
|
if !n.windowStartTime.IsZero() {
|
|
n.packets += packets
|
|
n.repeatedNacks += repeatedNacks
|
|
}
|
|
}
|
|
|
|
func (n *NackTracker) GetRatio() float64 {
|
|
ratio := 0.0
|
|
if n.packets != 0 {
|
|
ratio = float64(n.repeatedNacks) / float64(n.packets)
|
|
if ratio > 1.0 {
|
|
ratio = 1.0
|
|
}
|
|
}
|
|
|
|
return ratio
|
|
}
|
|
|
|
func (n *NackTracker) IsTriggered() bool {
|
|
if n.params.WindowMinDuration != 0 && !n.windowStartTime.IsZero() && time.Since(n.windowStartTime) > n.params.WindowMinDuration {
|
|
return n.GetRatio() > n.params.RatioThreshold
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func (n *NackTracker) ToString() string {
|
|
window := ""
|
|
if !n.windowStartTime.IsZero() {
|
|
now := time.Now()
|
|
elapsed := now.Sub(n.windowStartTime).Seconds()
|
|
window = fmt.Sprintf("t: %+v|%+v|%.2fs", n.windowStartTime.Format(time.UnixDate), now.Format(time.UnixDate), elapsed)
|
|
}
|
|
return fmt.Sprintf("n: %s, %s, p: %d, rn: %d, rn/p: %.2f", n.params.Name, window, n.packets, n.repeatedNacks, n.GetRatio())
|
|
}
|
|
|
|
func (n *NackTracker) GetHistory() []string {
|
|
return n.history
|
|
}
|
|
|
|
func (n *NackTracker) updateHistory() {
|
|
if len(n.history) >= 10 {
|
|
n.history = n.history[1:]
|
|
}
|
|
|
|
n.history = append(n.history, n.ToString())
|
|
}
|
|
|
|
// ------------------------------------------------
|